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Synthesis of diethanolamide (surfactant) from CaO/zeolite-catalysed used cooking oil has been conducted. The results showed that the yields of the reactions between methyl esters and diethanolamine with CaO concentration at 3%, 5%, and 7% were 64.47%, 92.91%, and 87.05%, respectively. The characterization showed that the higher surfactant concentration, the greater the capability of decreasing surface tension. The water-surfactant-pertalite system had an emulsion index of 67%. The new liquid mixture system (water-surfactant-pertalite) was observed for 4 days to investigate the emulsion stability. The CMC and HLB values were 1.5 g/L and 10.59, respectively. These results show that surfactant is applicable as a cleaning solution with a good emulsion stability.

Synthesis and Characterization of Diethanolamide (Surfactant) from Cao/Zeolite-Catalysed Used Cooking Oil